The Queen of the Classic Garden Border

By Ava Green

Tall, stately, and undeniably dramatic, the Delphinium or Larkspur is one of those perennial plants that stops people in their tracks. When given the right conditions, its towering floral spikes are magnificent. For gardeners who love a classic English border, nothing else compares. Yes, Delphiniums have lots of preferences, but tend to them, and they will reward you with a floral display that makes every bit of effort worthwhile. 

Choosing Your Delphiniums

With a wide number of varieties to choose from, there’s one that’s sure to fit every garden. Heights range from a modest 36 inches to an impressive 72 inches tall (Yes, 6 feet!), with a spread of 24 to 36 inches depending on the variety. So whether you have a compact border or a large sweeping bed, there’s a Delphinium to suit your space.

Their colour palette is equally diverse: rich blues and purples, soft pinks, crisp whites, and beautiful bicolours. Few flowers offer such a wide range. 

Planting

While Delphiniums prefer abundant moisture, be sure to plant the crown of the plant (where the stems meet the root ball) at soil level to avoid crown rot. Planting them too deeply is the most common way to lose these plants.

Spring and Fall are the ideal times to plant, giving roots a chance to establish themselves in cooler, more forgiving conditions. That said, a cool, overcast summer day works well too, just avoid planting during hot or humid spells. Spacing will depend on the variety you choose, so check the tag and give each plant the room it needs to breathe.  

Growing

Delphiniums are what gardeners affectionately call “Goldilocks plants”, they like things just right. Full sun, protection from strong winds, and fertile, humus-rich soil with excellent drainage are keys to success. They also love manure mixed into the soil to enrich their growing conditions. 

Their height is both their greatest asset and vulnerability. Because Delphinium flower stalks have hollow centres, they break easily if they’re exposed to the wind. Planting them in a sheltered spot is genuinely important. Once plants reach about 12 inches tall, stake each flower spike individually, or place a tomato cage around a clump early in the season before it’s needed. It’s much easier to stake proactively than to rescue a snapped stem after the fact.

Delphiniums are hungry plants and will perform best when fed generously. A dose of fertilizer, compost, or well-rotted manure in both spring and summer keeps them healthy and productive throughout the season.

Finally, don’t overlook dividing. Each spring, simply dig up the plant and cut the root ball in half. Now you have two plants for your border, or one to keep and one to share!

The Show

All that care pays off in late spring and early summer, when Delphiniums put on one of the most spectacular displays in the garden. Tall, densely packed spikes covered in richly coloured blooms rise above the border like beacons. Bold, beautiful, and completely unforgettable. 

Once the first flush of flowers begins to fade, and before the blooms turn to seed pods, cut the spent spikes back to just above the foliage. This encourages the plant to produce a second, smaller flush of blooms later in the season and extends the show! As the old foliage fades, trim it away to allow the fresh new growth to replace it.

Inspiration

There are plants you fit into a garden, and then there are plants you plan a garden around. Delphiniums belong firmly in the second category. Their height, colour, and presence make them one of the most inspiring and rewarding perennials a gardener can grow.

Stop by Eising Garden Centre to see what Delphinium varieties we have available this season. Our team is always happy to help you find the right fit for your garden and set you up for success. 

Expert Picks You Can Plant Right Now

By Ava Green

Looking for a flowering shrub that delivers season after season? We asked our experts at Eising Garden Centre to share their top picks, the ones that customers and staff love most, and they delivered. Whether you’re looking for spring blooms, fall colour, wildlife and pollinator value, or a shrub to suit your space, there’s something on this list for every garden.

Fuji Cherry ‘Little Twist’, Prunus incisa ‘CarltonLT’

As an accent in a small garden, or planted in a grouping in a larger garden, this multi-stemmed shrub is a gem! 

In early spring, crimson buds emerge before the leaves appear. Little Twist then produces clusters of lightly scented white, bell-shaped flowers with soft pink centres that grow along its stems, a stunning early-season display. It is a deciduous shrub, and leaves begin as green before shifting to coppery-bronze, then deepen to a rich burgundy in fall. Smooth, dark red bark adds interest in the winter once the leaves are gone.

This slow-growing, multi-stemmed shrub makes a striking feature in your garden.

Best for: Small gardens, accent planting, four-season interest. | Sun: Full sun | Mature size: 6 ft. tall × 6 ft. wide

Downy Serviceberry, Amelanchier canadensis

One of the most rewarding native shrubs you can plant, Downy Serviceberry earns its place in the garden from spring right through to fall. Showy clusters of fragrant white flowers in early spring, followed by small, sweet, edible purple-blue berries in early summer that are wonderful for making jam and an absolute favourite for birds. Come fall, the foliage puts on a spectacular show in shades of yellow, red, and orange.

As a bonus, choosing a native plant like Serviceberry supports local pollinators and wildlife, making it as ecologically valuable as it is beautiful. It works well as a specimen plant on it’s own, in a grouping or hedge, or naturalized in a larger landscape.

Best for: Wildlife gardens, naturalized areas, multi-season interest | Sun: Full sun to part shade | Mature size: 20 ft. tall × 10 ft. wide

Amur Privet, Ligustrum Amurense

Amur Privet

When fast growth and privacy matter, Amur Privet is one of the best choices available. This dense, dark green shrub produces white flower panicles in late spring and small black berries in fall. It responds exceptionally well to pruning after it blooms, making it an ideal candidate for a formal or informal hedge. If you need to fill a space quickly and create structure in your garden, this is a reliable, low-maintenance option. 

Best for: Hedging, screening, fast coverage | Sun: Full sun to part shade | Mature size: 12–15 ft. tall × 8–15 ft. wide

Viburnum ‘Fragrant Snowball’, Viburnum Opulus ‘Roseum’

Few shrubs stop people in their tracks quite like Fragrant Snowball Viburnum in full bloom. Large, rounded clusters of sweetly scented white flowers cover the plant in spring, creating a display that’s hard to match. While it doesn’t produce fruit, it earns its place again in the fall when the foliage transitions to rich shades of purple. 

Pruning after it blooms will help to keep it a manageable size and encourage healthy new growth. It’s also available as a standard, or tree form, which matures to a more compact 6 to 8 feet tall.

Sun or part shade are best for this deciduous shrub, a beautiful, solitary accent plant for the garden growing 12 feet high and 10 feet wide. As a standard, it is smaller, maturing at 6 to 8 feet tall and 5 to 6 feet wide.  

Best for: Specimen planting, cottage gardens, fragrance | Sun: Full sun to part shade | Mature size: 12 ft. tall × 10 ft. wide (shrub); 6–8 ft. tall (standard)

Snowbelle Mockorange, Philadelphus ‘Snowbelle’

Don’t let its compact size fool you; when Snowbelle Mockorange blooms in early summer, it puts on a big show. This dense, mounded shrub is blanketed in sweetly fragrant double white blooms that are absolutely irresistible to bees and butterflies. Once the flowers fade, its rich, dark-green deciduous foliage makes it a lovely backdrop for other blooming plants in the border.

Growing just four feet tall and wide, it’s one of the best choices for smaller beds, borders and foundation plantings. It prefers full sun but handles part shade as well.

Best for: Small borders, foundation planting, fragrance | Sun: Full sun to part shade | Mature size: 4 ft. tall × 4 ft. wide

More Flowering Shrubs Worth Exploring

This is just the beginning! At Eising Garden Centre, we also carry a wonderful selection of Azalea, Eastern Redbud, Kwanzan Flowering Cherry, Hydrangea, Dogwood, Butterfly Bush, Beauty Bush, Lilac, Rose of Sharon, Forsythia, and Potentilla, to name a few. 

The best way to find the right flowering shrub for your garden is to come in and see them in person, and right now is the perfect time to plant. Stop by and chat with Zach or Donna, who are always happy to help you find exactly what you’re looking for, based on your space, soil, and vision. We’re here to help you make the most of every corner of your garden!

By Dave Zeldon and Ely Schweyer

As plant people, we’ve all experienced that moment when we realize the novelty phase of that plant we brought home from the garden centre has worn off. The plant isn’t standing quite as tall, the flowers aren’t as bold, and the leaves are unravelling smaller or not at all. What is this magic they perform in the greenhouse? Perhaps you’ve provided sufficient lighting and adequate watering; there’s just one thing that is often overlooked because dirt is dirt, isn’t it?

  97% percent of plant tissue is made up of carbon, hydrogen, and oxygen pulled from the air and water, the remaining 3% is comprised of 16 other elements taken up from the soil. The quality of soil then is crucial to your plant’s health. Whether your plants are in pots or in ground, each soil type you could provide your plant offers something unique and may lack in another.

*Clay particles are even smaller than silt particles.

Resist the Urge to Slam Your Plant in Potting Soil

There’s bags and bags of rocks, sand, bark, manure, and moss on the shelves, yet the common buyer seems to always opt for potting mix. It’s fair; organic matter is usually great for plants and simple to use. However, most people don’t realize it’s merely an ingredient.

   Strictly using potting mix is like attempting to make a loaf of bread out of only flour. All those bags of other materials on the shelves are also components for a successful plant diet!

  Potting mix is a great base material, however, alone it presents risks of compacting, becoming waterlogged, can mold easily, and over time will become depleted of nutrients. Consider mixing the following ingredients into your pots, ground and raised beds to meet your plant’s required nutrients, pH level, and volume of moisture.

🖱️Use our Plant Finder to find some details on your plant! We try our best to keep this updated!

👍 Rule of Green Thumb: Plant roots can help you to determine the medium needed – thick, robust roots (i.e., yucca) typically enjoy chunkier materials, and smaller, delicate roots (i.e., begonias) enjoy finer materials.

Mulch and Bark Bites

• Mulch is the organic slow-release fertilizer, as it slowly decomposes, it lowers soil pH. However, may eventually compact soil once fully broken down.
• In the meantime, it creates shelves in the soil that create air pockets and prevent the soil from compacting. Mulch is a great short term medium for arid potted plants.
• If kept too wet, it can harbour fungus gnat larvae.
• Make sure when sourcing your mulch it doesn’t contain any black walnut.

🖱️ See more on mulching here. 

Sphagnum Peat Moss

• Peat moss is used to help retain moisture and lower pH in the soil given it is harvested from bogs.
• Retains nutrients very well.
• It is difficult to rehydrate once it loses moisture.

Coconut Coir

• Coco coir, much like peat moss is used to keep the soil moist and keep pH low, however it lasts longer and is possibly less invasive to harvest.

Sand

• Grains are relatively large and do not bind, allowing for excellent drainage depending on grade.
• Adds weight to top heavy plants.
• Has no ability to store minerals itself, however, pH can vary by its content of shells, minerals like silica, or fine organic matter.

Manure & Compost

• Source these organic by products locally and ensure they’re not too hot. These additions can significantly lower pH.
• Sheep manure is usually near free of weed seeds as sheep digest seeds better than cattle and horses!

Perlite

• Perlite is a volcanic byproduct (so it floats like pumice) that helps drainage in the soil and prevents compaction – vital in the case of starting seeds.
• If a rockier, well-draining medium is required for your plant, consider perlite.
• Perlite can expand holding trace amounts of water.
• Perlite has a neutral, slightly acidic pH.
• Make sure when sourcing perlite, that you are not being sold Styrofoam balls.

Vermiculite

• Vermiculite is a recycled mineral used similarly to perlite, and too has a neutral, slightly acidic pH.
• Expands with water content.
• Can contain amounts of potassium and magnesium (as well as good cation exchange capacity).
• Runs the potential risk of introducing asbestos into your soil.

Calcined Clay Materials

• Clay materials like recycled brick bits, pottery, or lecca are typically used for arid plants as it improves aeration and drainage.
• Can raise pH.
• Can retain some water.
• High cation exchange.
• Can also be used for starting robust cuttings when kept moist.  
• Probably not ideal for inground amendments.

Maintaining Your Plant’s Dietary Needs

Perhaps we’ve crafted the perfect soil type for your plant – your plant thanks you – but over time, we will end up in the same staling predicament. Why? Because with each thorough watering, we leech the soil of the provided nutrients. Best we use the plant-specific required fertilizer for your plant to prevent nutrient loss.

   Organic sources of fertilizer such as bonemeal, composts, and manures, along with the application of lime, will improve the physical condition of the soil in terms of water and element holding ability. Unfortunately, in many cases though, manures and lime alone cannot be depended upon to provide enough available nutrients in soils with low essential element reserves.

   Let’s talk about commercial fertilizers, which can help target your plant’s exact needs much like vitamins and supplements!

The Scoop on Fertilizers

Of the essential 16 elements your plant pulls from the soil, Nitrogen (N), Phosphorus (P), and Potassium (K) are the most critical for good plant growth. You’ll recognize the three numbers appearing on your commercial fertilizer labels known as the fertilizer analysis of the product, representing the percentage of each of the three "macronutrients" in the order of N, P & K.

Nitrogen (N) is necessary for green leafy or vegetative growth which is important in crops like corn, cabbage, and potatoes.

☝️ It is important to remember that you should not use a fertilizer which is high in nitrogen late in the summer on your perennials, as it may cause a boost of growth which will only freeze as the cold weather sets in. Also, too much nitrogen in the analysis could cause too much lush, leafy growth thus inhibiting the desired flowering aspect of a plant species.

Phosphorus (P) promotes the development of flowers, fruit and roots. Crops like tomatoes, cauliflower and garden flowers.

Potassium (K) boosts plant hardiness, stem strength, resistance to disease and drought which is important to all crops, but especially in potatoes, celery and rhubarb.

👍 Rule of Green Thumb: For foliage plants, provide them with shade and lots of nitrogen, and for flowering and fruiting plants, provide them with lots of sun and lots of phosphorus!

Amending Clay

Hello Haldimand and Eastern Norfolk!

   We’re presented with the challenge of compacted, often shallow and waterlogged clay, which proves difficult but not impossible.

   Clay becomes compacted and waterlogged as it is the smallest soil particle – smaller than a grain of sand, and even smaller than silt – with rough edges that allow it to interlock and bind. In this instance, roots cannot penetrate further into the soil, are susceptible to root rot, and air pockets are slim to none.

   This, however, can be fixed with the addition and renewal of the above materials.

  Mindful that you don’t create a watery bowl in the ground (score the edges the area being worked), you can add organic matter (i.e., manure, compost, and potting soil) for nutrients, as well as mulch, sand and perlite for aeration and drainage. Annual soil particle aggregation in clay soils increases air porosity (air pockets) and is accomplished by the incorporation of organic matter that breaks down to form humus.

🖱️ See more here for planting trees in clay. 

We hope this soil and fertilizer guide helps you provide all the vital nutrients to your beloved plants in ground and above ground! For more information - and soil – visit Eising Greenhouse and Garden Centre! 🌱

If you think a small space and a small garden are limiting when it comes to shrub choices, think again! Colour and texture, structure and seasonal interest are all available in many small shrubs. Whether you’re looking for beautiful blooms or evergreen foliage, you’ll love what our favourite small shrubs have to offer!

Follow the 5 links for more on our 5 favourites!

My Monet Purple Effect Weigela - Weigela florida

A deciduous shrub that’s deer resistant, colourful and low growing. This plant checks lots of boxes!! Variegated mint green and cream foliage with purple tones and pink blossoms, it makes a great companion to perennials, and as an edging plant. My Monet Purple Effect Weigela grows 18” to 2 ½ feet tall and wide in partial or full sun.

Little Gem Spruce - Picea abies ‘Little Gem’

This compact evergreen has dark green needles, making it attractive all year round. Its pyramidal shape makes it a great choice as an accent feature or in a border. It’s drought-tolerant and requires little care, making it a very appealing low-maintenance choice! Little Gem reaches a mature height of 10” to 1’ and a spread of 1’ to 2’. Plant this shrub in full sun.

Blue Star Juniper - Juniperus squamata ‘Blue Star’

Sun-loving and slow-growing, Blue Star Juniper graces the garden with steel blue evergreen foliage that’s a beautiful contrast to many plants. It’s also drought-tolerant and requires very little pruning, making it an easy to care for naturally small shrub. Growing 1 to 3’ tall and 1 ½ to 3’ wide, its shape makes it great as ground cover or as an edging plant.

Bluebeard - Caryopteris

Classified as a shrub or as a woody perennial, either way, it deserves to be on this list. Bluebeard loves full sun and grows anywhere from 2 to 4’ in a compact mound. Sweetly scented and long blooming, it attracts all the pollinators: bees, butterflies and hummingbirds. Bluebeard foliage and blooms come in various colours depending on the variety, so it’s easy to fit into your landscape plans.

Inkberry Holly - IIlex glabra

Native to North America, Inkberry has lots to love. It looks similar to Boxwood and can be trimmed to shape, but this slow-growing evergreen also forms a tidy mound, and it blooms in the Spring! It will grow in full to part sun, and smaller varieties reach 3 to 4’ high.

While this list contains 5 of our favourites, we have lots more to offer in the garden centre. Come by and take a look! Discover how growing small shrubs in containers or small spaces adds beauty and texture, enhancing your garden bed, patio or balcony.

TIP: April and May are the best months to plant shrubs in Southern Ontario.

The much-loved boxwood hedge has been a classic for centuries and is widely used in gardens worldwide. Neatly trimmed and manicured boxwood becomes the framework for containing everything from roses to riots of perennial blooms. From extensive estate gardens to small and modest yards, boxwood is a versatile shrub that earned its place by being easy to care for and prune.

Unfortunately, this staple shrub has trouble brewing, which impacts its leafy lifespan. 

Since its first appearance in Ontario in 2014, the Boxwood Blight has become a significant concern for gardeners. However, the University of Guelph is not sitting idly by. They are actively researching this issue and working hard to find solutions to protect beloved boxwood shrubs.

Sometimes, being popular isn’t all it’s cracked up to be. Because Boxwood is a widely planted favourite, a new pest attracted to it, the Boxwood Moth (from Asia), has easily spread and is infecting shrubs.

Beautiful Boxwood Alternatives

Boxwood Blight and Boxwood Moth do pose severe threats to Boxwood shrubs, but here's the good news—many shrubs make great alternatives! Using a similar shrub is one of the simplest solutions to Boxwood's issues. You have lots of options to protect and diversify your garden.

Inkberry Holly

The closest Boxwood lookalike is the Inkberry holly. It naturally grows in a rounded evergreen mound, can be trimmed like a traditional boxwood hedge, and has other enticing bonuses! Not only is it native to North America, but unlike boxwood, it blooms. In the spring, Inkberry holly is covered in showy white flowers, making it a standout alternative to boxwood. Here at Eising Greenhouses, look for Gem Box Inkberry Holly.

Upright Junipers

Blue Arrow and Moffat Blue Junipers make beautiful hedges and stand-alone accent trees. Both have an elegant upright form, striking blue evergreen foliage, and silvery blue berries from late spring to late fall. If that isn’t enticing enough, add drought tolerance to the list of features!

Showy Shapes and Standards

Consider a standard evergreen or a dwarf variety that has been pruned and sculpted to become a piece of art if you want to add something even more unusual. What’s a standard? It’s usually a single trunk with a plant at the top, like a compact evergreen shrub. 

Standards and shaped dwarf evergreens can make a bold statement or add wonderful whimsy to your garden. We have lots to choose from, but here are a few examples to get your imagination going!

When it comes to replacing boxwood, there are many creative solutions and beautiful plants to choose from!

For more information:

Landscape Ontario - Boxwood Blight and Boxwood Moth 

Toronto Master Gardeners - Rethinking Boxwood

Canada.ca - Box tree Moth